Perinone dyestuffs

ABSTRACT

Dyestuffs consisting of the mixture of isomers of the formulae ##STR1## wherein R 1  is hydrogen, alkyl with 1 to 20 carbon atoms, alkoxyalkyl or alkoxycarbonyl each with up to 4 carbon atoms, benzyl, alkoxycarbonyl with up to 20 carbon atoms or phenyl, R 2  is alkoxycarbonyl with up to 20 carbon atoms, cyano, alcanoyl, alkoxyalkoxycarbonyl each with up to 4 carbon atoms, carbonamido, phenylcarbonamido, mono- or dialkylcarbonamido with up to 8 carbon atoms or cyclohexylcarbonamido, R 3  and R 4  are identical and are hydrogen or alkoxy with 1 to 4 carbon atom atoms or R 3  is alkoxy with 1 to 4 carbon atoms and R 4  is hydrogen and R is phenylthio which may be substituted by one or two chlorine or bromine atoms, alkyl, alkoxy, carbalkoxy, alkylsulfonyl groups and with up to 4 carbon atoms or a cyano, trifluoromethyl or nitro group; naphthylthio, pyridinethio, benzimidazolyl-2-thio, benzoxazolyl-2-thio, benzthiazolyl-2-thio or an amino group of the formula ##STR2## wherein R 5  and R 6  are hydrogen, alkyl or hydroxyalkyl with 1 to 4 carbon atoms or phenyl, or together are piperidine, morpholine or piperazine. 
     The new dyestuffs are very suitable for the dyeing of synthetic materials such as polyethylene-glycol terephthalate, acetyl cellulose or polyamides. They yield brilliant greenish yellow to orange red shades which have a good fastness to light and to thermofixation. They are also very suitable for the dyeing of fibre-forming polymers such as for example polyethylene-glycol terephthalate in the mass. Furthermore, a big part of the dyestuffs can be used for dyeing synthetic fibre materials such as polyester fibers from organic solvents, for example perchloroethylene.

This is a division of application Ser. No. 384,794, filed Aug. 2, 1973, now U.S. Pat. No. 3,920,662.

The invention relates to a novel valuable dyestuff consisting of the mixture of isomers of the formulae I ##STR3## wherein R₁ is hydrogen, alkyl having 1 to 20 carbon atoms, alkoxyalkyl or alkoxycarbonyl having each up to 4 carbon atoms, benzyl, alkoxycarbonyl having up to 20 carbon atoms or phenyl, R₂ is alkoxycarbonyl having up to 20 carbon atoms, acyl, cyano, alkoxyalkoxycarbonyl having each up to 4 carbon atoms, carbonamido, phenylcarbonamido, mono- or dialkylcarbonamido having up to 8 carbon atoms or cyclohexylcarbonamido, R₃ and R₄ are identical and represent hydrogen atoms or alkoxy having 1 to 4 carbon atoms or R₃ is alkoxy having 1 to 4 carbon atoms and R₄ is hydrogen and R is a phenylthio group which may be substituted by one or two chlorine or bromine atoms, alkyl, alkoxy, carbalkoxy, alkylsulfonyl having each up to 4 carbon atoms or cyano, trifluoromethyl or nitro, a naphthylthio, pyridinethio, benzimidazolyl-2-thio, benzoxazolyl-2-thio, benzthiazolyl-2-thio group or an amino group of the formula ##STR4## wherein R₅ and R₆ represent hydrogen, alkyl or hydroxyalkyl having 1 to 4 carbon atoms or phenyl, whereby two alkyl groups may form a piperidine ring or under inclusion of an oxygen or nitrogen atom a morpholine or piperazine ring.

Preferred are the dyestuffs of the above formulae I, wherein R₁ represents lower alkyl, R₂ lower carbalkoxy or acyl and R represents an optionally substituted phenylthio or morpholine group.

The invention further relates to a process for preparing these novel dyestuffs, which comprises reacting in any order desired

a naphthalic acid hydrazide of the formula II or III ##STR5## wherein X is chlorine or bromine, with a compound of the formula IV

    R -- H                                                     (IV)

and a carbonyl compound of the formula V

    r.sub.1 -- coch.sub.2 -- r.sub.2                           (v)

whereby, in the reaction with the carbonyl compound (V) the hydrozone obtained first having the formula VI or VII ##STR6## subsequently was cyclized in the presence of basic condensation agents to give the pair of isomers of the formulae VIII and IX or X and XI ##STR7## R₁, R₂, R₃, R₄ and R have the above-mentioned meanings.

The starting compounds of the formula III may be prepared in known manner by condensation of 4-chloro- or 4-bromonaphthalic acid anhydrides with equivalent amounts of hydrazine in inert organic solvents such as alcohols or acid dialkyl amides (J. Am. Soc. 82, 2728 [1960]).

The reaction of those compounds of the formula IV which have an --SH group with the compounds of the formula III or X and XI is preferably carried out in the presence of at least the equivalent amount of an alkali acetate, hydroxide or -carbonate at an elevated temperature, preferably in an organic solvent, such as alcohol, pyridine or acid dialkyl amide. Examples for those mercapto compounds are thiophenol, 2- and 4-methyl-, 3,4-dimethyl-, 4-isopropyl-, 4-dodecyl-, 4-methoxy-, 3,4-dimethoxy-, 4-chloro-, 2,5-dichloro-, 4-bromo-, 2-methyl-5-chloro-, 2-methoxy-5-chloro-, 4-nitro-, 4-methylsulfonyl-, 3-ethoxycarbonyl-, 4-cyano-, 3-trifluoromethylthiophenol, α-thionaphthol, 4-mercaptopyridine, 2-mercaptobenzthiazole, 6-methyl-2-mercapto-, 6-methoxy-2-mercapto- and 5-chloro-2-mercaptobenzthiazole, 2-mercaptobenzimidazole, 2-mercaptobenzoxazole.

For the reaction with an amine of the formula ##STR8## the compounds III or X and XI are heated with an at least molar excess of the corresponding amine, if desired under pressure, to temperatures between about 100° C and about 200° C. The reaction time is about 1 to 8 hours. Condensation may also be carried out in a similar way in an organic solvent such as an acid dialkylamide, if desired in the presence of an acid-binding agent such as for example Na- or potassium acetate. The product formed may be isolated in usual manner either directly or after diluting with water or a suitable solvent having a low boiling point such as methanol.

Examples for these amines are aniline, o-toluidine, methyl and ethyl-aniline, 3-trifluoromethyl-aniline, 3-tetrafluoroethoxy-aniline, N-β-hydroxyethyl-aniline, 3-ethylaminotoluene, 3-β-hydroxyethylamino-toluene, dimethyl amine, dibutyl amine, di-(cyanethyl)-amine, di-(chloroethyl)-amine, diethanolamine, morpholine, 2,6-dimethyl-morpholine, piperidine, 4-methylpiperidine.

For the reaction with the carbonyl compound of the formula V the compounds of the formula II or III are condensed at first with at least equivalent amounts of this carbonyl compound in the presence of about 0.01 to 0.1 mol of an acidic condensation agent per mol of starting compound. As acidic condensation agents may be considered aromatic sulfonic acids such as benzene or toluene-sulfonic acid, alkane-sulfonic acids such as ethane-sulfonic acid, amidosulfonic acid, sulfuric acid, phosphoric acid or gaseous hydrogen chloride. When using protic solvents such as acetic acid or propionic acid, these solvents already act as acidic condensation agent.

Condensation may be effected either in an inert organic solvent such as ethanol, isobutanol, monomethylglycol, acetic acid, chlorobenzene, dichlorobenzene, nitrobenzene, dimethyl formamide, N-methylpyrrolidone or directly with an excess of the carbonyl compound at a temperature of from about 80° C to about 200° C, if desired under pressure. The reaction time is between about 30 minutes and 8 hours. In some cases it is suitable to remove the reaction water and other easily volatile by-products such as alcohol and acetone by distillation from the reaction mixture. After cooling the hydrazone formed may be isolated directly or after diluting with a solvent precipitating the hydrazone, such as for example methanol, glacial acetic acid or water.

Examples for carbonyl compounds of the formula V are acetoacetic acid methyl-, ethyl-, butyl-, isopropyl-, -2-ethoxyethyl ester, γ-diethylacetoacetic acid ethyl ester, phenylacetoacetic acid ethyl ester, benzoyl and 4-methoxybenzoylacetic acid ethyl ester, oxalacetic acid diethyl ester, acetyl-acetone, benzoylacetone, γ-dimethylacetylacetone, dibenzoylmethane, γ-ethoxyacetylacetone, acetyl- and benzoyl pyruvic acid ethyl ester, acetonedicarboxylic acid dimethyl ester, benzoylacetonitrile, formylacetophenone, acetoacetic acid amide, acetoacetic acid methyl- and diethylamide, acetoacetic acid -anilide, -p-anisidide, -3-chloro-anilide, -5chloro-2-toluidide, -o-toluidide, -cyclohexylamide, -octylamide, 2,4-dichlorobenzoylacetic acid amide.

The ring closure of the hydrazone to form the pyrazol is expediently carried out in an organic solvent such as butanol, isobutanol, pyridine, dimethyl sulfoxide, but preferably in acid dialkyl amides such as dimethyl formamide, dimethyl acetamide, hexamethyl-phosphoric acid triamide or N-methylpyrrolidone in the presence of a basic compound such as sodium or potassium acetate, -carbonate or hydroxide, piperidine, morpholine or triethyl amine at a temperature of from about 80° C and the boiling point of the solvent used.

If the hydrazone has already been prepared in an organic solvent of the above-mentioned type, it may be cycled directly in the reaction mixture, without previous isolation, after neutralization of the acidic condensation agent by addition of one of the bases mentioned. The product thus obtained may be isolated in usual manner.

The new dyestuffs are very suitable for the dyeing of synthetic materials such as polyethylene-glycol terephthalate, acetyl cellulose or polyamides. They yield brilliant greenish yellow to orange red shades which have a good fastness to light and to thermofixation. They are also very suitable for the dyeing of fibre-forming polymers such as for example polyethylene-glycol terephthalate in the mass. Furthermore, a big part of the dyestuffs can be used for dyeing synthetic fibre materials such as polyester fibers from organic solvents, for example perchloroethylene.

In contradistinction to next comparable dyestuffs known from German Pat. Nos. 1,279,260 and 1,265,325 the products of the invention are distinguished by a better affinity to polyester and a better fastness of the dyeings to sublimation.

The following Examples illustrate the invention.

EXAMPLE 1

a. 64.0 Grams of 4-phenylthionaphthalic acid were stirred for 2 hours at 130° C in 180 g of acetacetic acid ethyl ester in the presence of 0.34 g of p-toluene-sulfonic acid, while passing thru a weak nitrogen stream. The clear solution was cooled to room temperature, diluted with 200 ml of methanol, and the crystallized light-yellow ethylester hydrazone was suction-filtered, washed with methanol and water and dried. The compound melted at 152°-153° C. If instead of acetacetic acid ethyl ester the same amount of the corresponding methyl ester was used, the methylester hydrazone having a melting point of 181°-183° C was obtained in analogous way.

b. A mixture of 86.4 g of the ethyl ester hydrazone obtained according to (a), 300 ml of dimethyl formamide and 0.4 g of anhydrous potassium acetate was kept at the boil for 1 hour. When cooling, the mixture of dyestuff isomers of the formulae ##STR9## was crystallized in golden-yellow crystals. The suspension was diluted with 300 ml of ethanol, suction-filtered, washed with water and dried.

Analysis: Calc: C 69.6, H 4.3, N 6.8, S 7.7; Found: C 69.5, H 4.5, N 7.2, S 7.6.

On polyester fabrics brilliant greenish-yellow dyeings were obtained having a very good fastness to light and to sublimation.

Dyeings having similar properties were obtained with the dyestuff obtained in the same manner from the methylester hydrazone.

c. The same mixture of dyestuff isomers was obtained when 21.6 g of the ethyl ester hydrazone obtained according to (a), 200 ml of ethylglycol-monomethyl ether and 0.1 g of potassium hydroxide were cyclized for 1 hour at boiling temperature.

EXAMPLE 2

a. 75.0 Grams of acetylacetone were added to a mixture of 96.0 g of 4-phenylthionaphthalic acid hydrazide, 525 ml of isobutanol and 0.6 g of benzene-sulfonic acid and the mixture was kept at the boil for 3 hours. The hydrazone which crystallized, when cooling, in slightly yellow needles was suction-filtered, washed with methanol and water and dried. It melted at 197°-200° C.

b. 10.0 Grams of the hydrazone obtained according to (a) were refluxed in 80 ml of isobutanol after addition of 0.2 g of anhydrous potassium acetate. The yellow mixture of dyestuff isomers precipitated having the formulae ##STR10## was suction-filtered at room temperature, washed with methanol and water and dried.

Analysis: Calc: C 71.8, H 4.2, N 7.3, S 8.3; Found: C 71.9, H 4.3, N 7.3, S 8.3.

The compound dyed polyester fibres in brilliant yellow shades which are distinguished by an excellent fastness to light and to sublimation.

c. A mixture of 15 g of the hydrazone obtained according to (a), 30 g of dimethyl formamide and 0.5 g of piperidine was kept at the boil for 2 hours. The mixture of dyestuff isomers which crystallized when cooling was identical to the product obtained according to (b). Instead of piperidine the equivalent amount of morpholine or triethyl amine may be used with the same success as a catalyst.

EXAMPLE 3

a. A suspension of 25 g of 3-methoxy-4-(4'-chlorophenylthio)-naphthalic acid hydrazide and 150 g of acetyl acetone was stirred for one hour at boiling temperature after addition of 0.25 g of toluene-sulfonic acid. The crystal suspension obtained when cooling was diluted with 200 ml of methanol and the yellow hydrazone was isolated in known manner.

b. 25 Grams of the compound obtained according to (a) were stirred for one hour at 140°-145° C in 75 g of N-methylpyrrolidone in the presence of 0.3 g of anhydrous sodium acetate.

100 Milliliters methanol were added to the cooled reaction mixture and the reddish yellow dyestuff of the formula ##STR11## which had precipitated was isolated in usual manner. Polyester fabrics were dyed with this mixture of isomers in brilliant golden yellow shades fast to light.

EXAMPLE 4

a. 16.0 Grams of 4-phenylthionaphthalic acid hydrazide, 35 g of acetoacetic acid anilide and 0.25 g of toluene-sulfonic acid were suspended in 100 ml of chlorobenzene. The reaction mixture was refluxed for 3 hours. Then 35 ml of chlorobenzene were distilled off. The reaction product formed was crystallized showly at room temperature. After diluting with 150 ml of methanol stirring was continued for some hours, then the pale yellow hydrazone was suction-filtered, washed with methanol and water and dried.

b. 19.2 Grams of the hydrazone obtained according to (a), 58.0 g of dimethyl acetamide and 0.25 g of anhydrous potassium carbonate were heated for 30 minutes to 150° C, the mixture was diluted with 100 ml of methanol at 20°-25° C and the lemon-yellow pair of dyestuff isomers which had precipitated corresponding to the formulae ##STR12## was precipitated in usual manner.

Analysis: Calc: C 72.8, H 4.1, N 9.1, S 6.9; Found: C 72.8, H 3.8, N 9.3, S 7.0.

On polyester fibres greenish yellow dyeings were obtained having a good fastness to light and to thermofixation.

EXAMPLE 5

a. 32.0 Grams of 4-phenylthionaphthalic acid hydrazide were stirred in 80 ml of acetone-dicarboxylic acid dimethyl ester. 0.25 Gram of toluene-sulfonic acid was added and the mixture was heated to 125° C by passing thru a weak nitrogen stream. After 1.5 hours the reaction mixture was cooled and diluted at 50° C with 100 ml of methanol. The lemon-yellow hydrazone precipitated melted at 187°-190° C.

Analysis: Calc: N 5.9, S 6.7; Found: N 5.7, S 6.8.

b. A mixture of 33.4 g of the hydrazone obtained according to (a), 80 ml of dimethyl formamide and 0.33 g of anhydrous potassium acetate was stirred for 15 minutes at 145° C. Then the mixture was diluted at 20°-25° C with 50 ml of methanol. The crystallized reddish yellow dyestuff of the formula ##STR13## had an excellent affinity to polyester fibre materials. It yielded a brilliant yellow with a very good fastness to light and to sublimation.

Analysis: Calc: C 65.4, H 3.9, N 6.1, S 6.9; Found: C 64.6, H 4.0, N 5.9, S 6.9.

EXAMPLE 6

a. 32.0 Grams of 4-phenylthionaphthalic acid hydrazide, 32.5 g of benzoyl acetone and 0.24 g of toluene-sulfonic acid were stirred in 120 ml of o-dichlorobenzene for 2 hours at 130°-135° C. The lemon-yellow hydrazone formed having a melting point of 199°-202° C was isolated as usual with 100 ml of methanol.

Analysis: Calc: N 6.0, S 6.9; Found: N 5.6, S 6.7.

b. 32.4 Grams of the hydrazone obtained according to (a) were cyclized according to Example 5(b). The mixture of dyestuff isomers formed of the formula ##STR14## dyed polyester fabrics in brilliant greenish yellow shades. The dyeings were distinguished by a very good fastness to light and an excellent fastness to light and to thermofixation.

EXAMPLE 7

a. A mixture of 24.6 g of 4-chloronaphthalic acid hydrazide, 20.0 g of acetyl acetone and 100 ml of acetic acid was refluxed for 2 hours. The brownish crystal powder was suction-filtered, washed with glacial acetic acid and dried. After recrystallization from ethylene-glycol-monomethyl ether slightly brownish crystals were obtained which melted at 211°-213° C.

b. 20.4 Grams of the hydrazone obtained according to (a) were refluxed with 61.2 g of dimethyl formamide and 0.2 g of anhydrous potassium carbonate for 30 minutes. When cooling, the slightly brownish yellow cyclization product was crystallized at about 75° C. It consisted of the mixture of isomers of the formulae ##STR15##

Analysis: Calc: Cl 11.4, N 9.0; Found: Cl 11.6, N 9.1.

c. The mixture of pyrazolisomers obtained according to (b) could be prepared without intermediate isolation of the hydrazone obtained according to (a), when the reaction was carried out as follows:

24.6 Grams of 4-chloronaphthalic acid hydrazide, 20.0 g of acetyl acetone and 0.24 g of toluene-sulfonic acid were refluxed and kept at the boil for 2 hours. Then 0.15 g of potassium carbonate and 0.5 g of anhydrous potassium acetate was added at 80° C and again kept at the boil for 2 hours. The mixture of pyrazolisomers was identical with the product obtained according to (b).

d. 9.8 Grams of 2,5-dichlorothiophenol were added to a mixture of 15.5 g of the mixture of isomers obtained according to (b) and 10.0 g of anhydrous potassium acetate in 150 ml of ethylene-glycol-monomethyl ether, and the mixture was stirred for 1 hour at boiling temperature. The drystallized yellow mixture of dyestuff isomers of the formulae ##STR16## was isolated in usual manner. Polyester fabrics could be dyed in brilliant yellow shades fast to light and to sublimation. If instead of 2,5-dichlorothiophenol the equivalent amount of 4-methyl-3,4-dimethoxy, 2-methyl-5-chloro, 4-bromo- or 3-ethoxythiophenol was used, yellow pairs of dyestuff isomers were obtained having similar tinctorial properties.

EXAMPLE 8

24.6 Grams of 4-chloronaphthalic acid hydrazide, 20.0 g of acetyl acetone and 0.24 g of toluene-sulfonic acid were refluxed in 250 ml of isobutanol for 2 hours. Then 20.0 g of anhydrous potassium acetate and 12.0 g of thiophenol were added to the reaction mixture at room temperature, and the mixture was kept again at the boil. Finally 7 g of potash were added at 70° C and the whole was stirred at boiling temperature for 1 hour. The dyestuff formed was identical with the dyestuff obtained according to Example 2b.

EXAMPLE 9

a. 8 Drops of concentrated sulfuric acid were added to a mixture of 29.1 g of 4-bromonaphthalic acid hydrazide and 32.5 g of benzoyl acetone in 100 ml of chlorobenzene. The reaction mixture was stirred for one hour at boiling temperature. After cooling the mixture was diluted with 100 ml of methanol and the nearly colorless hydrazone crystallized was isolated in usual manner. It was cyclized according to Example 7b to form the mixture of pyrazolisomers of the formulae ##STR17##

b. 21.5 Grams of the mixture of isomers obtained according to (a) and 10.0 g of anhydrous potassium carbonate were suspended in 240 ml of butanol. After adding 13.5 g of 4-methylthiophenol the mixture was refluxed for 3 hours. The yellow dyestuff mixture obtained of the formula ##STR18## dyed on polyester materials a clear greenish yellow having a very good fastness to light and to sublimation.

EXAMPLE 10

a. 0.25 Grams of toluene-sulfonic acid was added to a mixture of 18.5 g of 4-(benzimidazolo-2'-thio)-naphthalic acid hydrazide and 75.5 g of acetyl acetone, and the mixture was heated to the boil for 30 minutes. At 70° C the reaction mixture was diluted with 80 ml of methanol. The light-yellow hydrazone formed was isolated as usual. It melted at 268° C under decomposition.

b. 9.2 Grams of the hydrazone obtained according to (a) and 0.2 g of anhydrous potassium acetate were stirred in 35 ml of dimethyl formamide for 10 minutes at 145° C. The mixture was diluted at 20°-25° C with 30 ml of methanol. The crystallized reddish yellow mixture of isomers of the formula ##STR19## dyed polyester with a clear yellow fast to sublimation. The following Table lists further dyestuffs which have been obtained according to the methods described in the above Examples:

    __________________________________________________________________________                                                  Shade                             Example                                                                             R.sub.1  R.sub.2      R.sub.3                                                                            R.sub.4                                                                            R         (polyester)                       __________________________________________________________________________     11   CH.sub.3 COOC.sub.3 H.sub.7                                                                          H   H                                                                                   ##STR20##                                                                               greenish yellow                   12   CH.sub.3 COOC.sub.4 H.sub.9                                                                          H   H                                                                                   ##STR21##                                                                               greenish yellow                   13   CH.sub.3 COOC.sub.2 H.sub.5                                                                          OCH.sub.3                                                                          H                                                                                   ##STR22##                                                                               yellow                            14   CH.sub.3 COOCH.sub.3  OCH.sub.3                                                                          H                                                                                   ##STR23##                                                                               reddish yellow                    15   C.sub.2 H.sub.5                                                                         COOC.sub.2 H.sub.5                                                                          H   H                                                                                   ##STR24##                                                                               yellow                             16  CH.sub.3 COOC.sub.2 H.sub.5                                                                          H   H                                                                                   ##STR25##                                                                               greenish yellow                   17   CH.sub.3 COOC.sub.2 H.sub.5                                                                          H   H                                                                                   ##STR26##                                                                               greenish yellow                   18   CH.sub.3 COOC.sub.2 H.sub.5                                                                          H   H                                                                                   ##STR27##                                                                               yellow                            19                                                                                   ##STR28##                                                                              COOC.sub.2 H.sub.5                                                                          H   H                                                                                   ##STR29##                                                                               greenish yellow                   20                                                                                   ##STR30##                                                                              COOC.sub.2 H.sub.5                                                                          H   H                                                                                   ##STR31##                                                                               greenish yellow                   21                                                                                   ##STR32##                                                                              COOC.sub.2 H.sub.5                                                                          H   H                                                                                   ##STR33##                                                                               greenish yellow                   22   CH.sub.2 OCH.sub.3                                                                      COOC.sub.2 H.sub.5                                                                          H   H                                                                                   ##STR34##                                                                               yellow                            23                                                                                   ##STR35##                                                                              COOC.sub.2 H.sub.5                                                                          H   H                                                                                   ##STR36##                                                                               yellow                            24   CH.sub.3 COCH.sub.3   H   H                                                                                   ##STR37##                                                                               greenish yellow                   25   CH.sub.3 COCH.sub.3   H   H                                                                                   ##STR38##                                                                               greenish yellow                   26   CH.sub.3 COCH.sub.3   OCH.sub.3                                                                          OCH.sub.3                                                                           ##STR39##                                                                               reddish red                       27   CH.sub.3 COCH.sub.3   OC.sub.2 H.sub.5                                                                   H                                                                                   ##STR40##                                                                               yellow                            28   CH.sub.3 COCH.sub.3   H   H                                                                                   ##STR41##                                                                               yellow                            29   CH.sub.3 COCH.sub.3   H   H                                                                                   ##STR42##                                                                               yellow                            30   CH.sub.3 COCH.sub.3   H   H                                                                                   ##STR43##                                                                               yellow                            31   CH.sub.3 COCH.sub.3   H   H                                                                                   ##STR44##                                                                               yellow                            32   CH.sub.3 COCH.sub.3   OCH.sub.3                                                                          H                                                                                   ##STR45##                                                                               reddish yellow                    33   CH.sub.3 COCH.sub.3   H   H                                                                                   ##STR46##                                                                               yellow                            34                                                                                   ##STR47##                                                                              COCH.sub.3   H   H                                                                                   ##STR48##                                                                               greenish yellow                   35                                                                                   ##STR49##                                                                              COCH.sub.3   H   H                                                                                   ##STR50##                                                                               greenish yellow                   36                                                                                   ##STR51##                                                                              COCH.sub.3   OCH.sub.3                                                                          H                                                                                   ##STR52##                                                                               yellow                            37                                                                                   ##STR53##                                                                              CN           H   H                                                                                   ##STR54##                                                                               greenish yellow                   38                                                                                   ##STR55##                                                                               ##STR56##   H   H                                                                                   ##STR57##                                                                               greenish yellow                   39   CH.sub.3                                                                                 ##STR58##   H   H                                                                                   ##STR59##                                                                               yellow                            40   CH.sub.3 COCH.sub.2 OC.sub.2 H.sub.5                                                                 H   H                                                                                   ##STR60##                                                                               yellow                            41   H                                                                                        ##STR61##   H   H                                                                                   ##STR62##                                                                               greenish yellow                   42   H        COCH.sub.3   H   H                                                                                   ##STR63##                                                                               yellow                            43   COOC.sub. 2 H.sub.5                                                                     COOC.sub. 2 H.sub.5                                                                         H   H                                                                                   ##STR64##                                                                               yellow                            44   COOC.sub.2 H.sub.5                                                                      COCH.sub.3   H   H                                                                                   ##STR65##                                                                               yellow                            45   CH.sub.2 COOCH.sub.3                                                                    COOCH.sub.3  H   H                                                                                   ##STR66##                                                                               greenish yellow                   46   CH.sub.2 COOC.sub.2 H.sub.5                                                             COOC.sub.2 H.sub.5                                                                          H   H                                                                                   ##STR67##                                                                               yellow                            47   CH.sub.2 COOCH.sub.3                                                                    COOCH.sub.3  OCH.sub.3                                                                          H                                                                                   ##STR68##                                                                               reddish yellow                    48   CH.sub.3                                                                                 ##STR69##   H   H                                                                                   ##STR70##                                                                               greenish yellow                   49   CH.sub.3                                                                                 ##STR71##   H   H                                                                                   ##STR72##                                                                               greenish yellow                   50   CH.sub.3                                                                                 ##STR73##   H   H                                                                                   ##STR74##                                                                               greenish yellow                   51   CH.sub.3                                                                                 ##STR75##   H   H                                                                                   ##STR76##                                                                               greenish yellow                   52   CH.sub.3                                                                                 ##STR77##   H   H                                                                                   ##STR78##                                                                               greenish yellow                   53   CH.sub.3 CONHC.sub.8 H.sub.17                                                                        H   H                                                                                   ##STR79##                                                                               greenish yellow                   54   CH.sub.3 COCH.sub.3   H   H                                                                                   ##STR80##                                                                               yellow                            55   CH.sub.3 COOC.sub.2 H.sub.4 OC.sub.2 H.sub.5                                                         H   H                                                                                   ##STR81##                                                                               greenish yellow                   56   CH.sub.3 COOC.sub.2 H.sub.4 OC.sub.2 H.sub.5                                                         H   H                                                                                   ##STR82##                                                                               greenish yellow                   57   CH.sub.3 COOCH.sub.2 CH.sub.2 OCH.sub.3                                                              H   H                                                                                   ##STR83##                                                                               greenish yellow                   58   CH.sub.3 COO(CH.sub.2).sub.11 CH.sub.3                                                               H   H                                                                                   ##STR84##                                                                               greenish yellow                   59   CH.sub.3 COO(CH.sub.2).sub.15 CH.sub.3                                                               H   H                                                                                   ##STR85##                                                                               greenish yellow                   60   CH.sub.3 COO(CH.sub.2).sub.17 CH.sub.3                                                               H   H                                                                                   ##STR86##                                                                               greenish yellow                   61   CH.sub.3                                                                                 ##STR87##   H   H                                                                                   ##STR88##                                                                               greenish yellow                   62   (CH.sub.2).sub.16 CH.sub.3                                                              COOC.sub.2 H.sub.5                                                                          H   H                                                                                   ##STR89##                                                                               greenish yellow                   63   (CH.sub.2).sub.10 CH.sub.3                                                              COOC.sub.2 H.sub.5                                                                          H   H                                                                                   ##STR90##                                                                               greenish yellow                   __________________________________________________________________________

EXAMPLE 64

a. 29.7 Grams of 4-morpholino-naphthalic acid hydrazide were kept at the boil with 20.0 g of acetyl acetone and 0.24 g of toluene-sulfonic acid in 100 ml of chlorobenzene for 30 minutes, while the reaction water was distilled off. The crystallized golden yellow hydrazone was suction-filtered at room temperature, washed with methanol and water and dried.

b. 50.0 Grams of the hydrazone obtained according to (a) were suspended in 125 g of dimethyl formamide and after addition of 0.5 g of potassium acetate refluxed for 30 minutes. The dyestuff mixture of the formulae ##STR91## which crystallized when cooling, was suction-filtered after diluting with methanol, washed with methanol and water and dried. From methyl glycol the compound crystallized in brilliant orange crystals.

Analysis: Calc: C 69.8, H 5.2, N 11.6; Found: C 69.5, H 5.4, N 11.8.

With this dyestuff polyester materials could be dyed in brilliant orange shades having a good fastness to light and to sublimation.

EXAMPLE 65

If the reaction was carried out as indicated in Example 64a and (b), but the 4-morpholino-naphthalic acid hydrazide was replaced by the equivalent amount of 3-methoxy-4-morpholinonaphthalic acid hydrazide, the red dyestuff mixture of the following formulae was obtained ##STR92## which dyed polyester fibres in brilliant orange red shades.

EXAMPLE 66

If in Example 64a 20.0 g of acetyl acetone were replaced by 32.5 g of benzoyl acetone and the reaction was carried out in anologous manner, the corresponding lemon-yellow hydrazone was obtained which could be cyclized according to (b) to the orange pair of dyestuff isomers of the formulae ##STR93##

On polyester fabrics brilliant orange yellow dyeings were obtained, which were distinguished by a good fastness to light and an excellent fastness to sublimation.

EXAMPLE 67

A mixture of 9.3 g of the naphthoylene pyrazole obtained according to Example 7b, 15.0 g of morpholine and 2.0 g of N-methyl pyrrolidone was refluxed for 1 hour. When cooling, the orange pair of dyestuff isomers was crystallized. It was identical with the product obtained according to Example 64b.

EXAMPLE 68

a. 26.0 Grams of 4-(2',6'-dimethylmorpholino)-naphthalic acid hydrazide, 70.0 g of acetoacetic acid ethyl ester and 0.22 g of toluene-sulfonic acid were converted into the corresponding yellow hydrazone as described in Example 1a.

b. 25.0 g of this hydrazone were cyclized as indicated in Example 64b in 50.0 g of dimethyl acetamide in the presence of 0.25 g of anhydrous potassium acetate to give the mixture of dyestuff isomers of the formulae ##STR94##

Polyester materials could be dyed in brilliant orange shades having good fastness properties.

EXAMPLE 69

4.0 Grams of 4-(4'-methylphenylamino)-naphthalic acid hydrazide obtained by condensation of 4-bromonaphthalic acid hydrazide with 4-aminotoluene, were kept at the boil for 1 hour in 20 ml of acetyl acetone in the presence of 0.04 g of toluene-sulfonic acid. After cooling the mixture was diluted with 40 ml of methanol and the brownish-yellow hydrazone which crystallized slowly was isolated in known manner. After addition of 0.02 g of anhydrous potassium acetate 2.0 g of this hydrazone were converted with 2.0 g of dimethyl formamide, by boiling for 10 minutes, into the red dyestuff mixture of the formula ##STR95##

Polyester fibres could be dyed in reddish orange shades.

The following Table contains further Examples of dyestuffs which can be obtained in analogy to the above Examples. ##STR96##

    __________________________________________________________________________                                                  Shade                             Example                                                                             R.sub.1 R.sub.2      R.sub.3                                                                            R.sub.4                                                                          R            (polyester)                       __________________________________________________________________________     70   CH.sub.3                                                                               COOCH.sub.3  H   H                                                                                             orange yellow                     71   CH.sub.3                                                                               COOC.sub.2 H.sub.5                                                                          H   H                                                                                 ##STR97##   orange yellow                     72   CH.sub.3                                                                               COOC.sub.4 H.sub.9                                                                          H   H                                                                                 ##STR98##   orange yellow                     73                                                                                   ##STR99##                                                                             COOC.sub.2 H.sub.5                                                                          H   H                                                                                 ##STR100##  orange yellow                     74   CH.sub.3                                                                               COOC.sub.2 H.sub.5                                                                          OCH.sub.3                                                                          H                                                                                 ##STR101##  orange yellow                     75   CH.sub.3                                                                               COOC.sub.2 H.sub.5                                                                          H   H                                                                                 ##STR102##  orange                            76                                                                                   ##STR103##                                                                             ##STR104##  H   H                                                                                 ##STR105##  orange                            77   CH.sub.3                                                                                ##STR106##  H   H                                                                                 ##STR107##  orange yellow                     78   CH.sub.2 COOCH.sub.3                                                                   COOCH.sub.3  H   H                                                                                 ##STR108##  orange yellow                     79   CH.sub.3                                                                               COCH.sub.3   H   H                                                                                 ##STR109##  orange                            80   CH.sub.3                                                                               COCH.sub.3   H   H                                                                                 ##STR110##  reddish orange                    81                                                                                   ##STR111##                                                                            COCH.sub.3   H   H                                                                                 ##STR112##  reddish orange                    82   CH.sub.3                                                                               COCH.sub.3   H   H                                                                                 ##STR113##  orange                            83   CH.sub.3                                                                               COCH.sub.3   H   H                                                                                 ##STR114##  orange                            84   CH.sub.3                                                                               COCH.sub.3   H   H                                                                                 ##STR115##  reddish orange                    85   CH.sub.3                                                                               COOCH.sub.2 CH.sub.2 OCH.sub.3                                                              H   H                                                                                 ##STR116##  orange yellow                     86   CH.sub.3                                                                               COOCH.sub.2 CH.sub.2 OC.sub.2 H.sub.5                                                       H   H                                                                                 ##STR117##  orange yellow                     87   CH.sub.3                                                                               COO(CH.sub.2).sub.11 CH.sub.3                                                               H   H                                                                                 ##STR118##  orange yellow                     88   CH.sub.3                                                                                ##STR119##  H   H                                                                                 ##STR120##  orange yellow                     89   CH.sub.3                                                                               COOC.sub.2 H.sub.5                                                                          H   H                                                                                 ##STR121##  orange yellow                     __________________________________________________________________________ 

We claim:
 1. Dyestuffs consisting of the mixture of isomers of the formulae ##STR122## wherein R₁ is hydrogen, alkyl with 1 to 20 carbon atoms, alkoxyalkyl or alkoxycarbonyl each with up to 4 carbon atoms, benzyl, alkoxycarbonyl with up to 20 carbon atoms or phenyl, R₂ is alkoxycarbonyl with up to 20 carbon atoms, cyano, alkanoyl, alkoxyalkoxycarbonyl each with up to 4 carbon atoms, carbonamido, phenylcarbonamido, mono- or dialkylcarbonamido with up to 8 carbon atoms or cyclohexylcarbonamido, R₃ and R₄ are identical and are hydrogen or alkoxy with 1 to 4 carbon atoms or R₃ is alkoxy with 1 to 4 carbon atoms and R₄ is hydrogen and R is an amino group of the formula ##STR123## wherein R₅ and R₆ together are morpholine or 2,6-dimethylmorpholine.
 2. The dyestuff consisting of the mixture of isomers of the formulae ##STR124##
 3. The dyestuff consisting of the mixture of isomers of the formulae ##STR125##
 4. Dyestuff mixture as defined in claim 1, wherein R₁ is methyl, R₂ is carbomethoxy, R₃ and R₄ are hydrogen and R is 2,6-dimethylmorpholyl. 